[apple/xnu.git] / bsd / netinet / tcp_seq.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1982, 1986, 1993, 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)tcp_seq.h	8.3 (Berkeley) 6/21/95
 * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.5 2001/08/22 00:59:12 silby Exp $
 */

#ifndef _NETINET_TCP_SEQ_H_
#define _NETINET_TCP_SEQ_H_
#include <sys/appleapiopts.h>
/*
 * TCP sequence numbers are 32 bit integers operated
 * on with modular arithmetic.  These macros can be
 * used to compare such integers.
 */
#define	SEQ_LT(a,b)	((int)((a)-(b)) < 0)
#define	SEQ_LEQ(a,b)	((int)((a)-(b)) <= 0)
#define	SEQ_GT(a,b)	((int)((a)-(b)) > 0)
#define	SEQ_GEQ(a,b)	((int)((a)-(b)) >= 0)

/* for modulo comparisons of timestamps */
#define TSTMP_LT(a,b)	((int)((a)-(b)) < 0)
#define TSTMP_GEQ(a,b)	((int)((a)-(b)) >= 0)

/*
 * TCP connection counts are 32 bit integers operated
 * on with modular arithmetic.  These macros can be
 * used to compare such integers.
 */
#define	CC_LT(a,b)	((int)((a)-(b)) < 0)
#define	CC_LEQ(a,b)	((int)((a)-(b)) <= 0)
#define	CC_GT(a,b)	((int)((a)-(b)) > 0)
#define	CC_GEQ(a,b)	((int)((a)-(b)) >= 0)

/* Macro to increment a CC: skip 0 which has a special meaning */
#define CC_INC(c)	(++(c) == 0 ? ++(c) : (c))

#ifdef __APPLE_API_PRIVATE
/*
 * Macros to initialize tcp sequence numbers for
 * send and receive from initial send and receive
 * sequence numbers.
 */
#define	tcp_rcvseqinit(tp) \
	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1

#define	tcp_sendseqinit(tp) \
	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
	    (tp)->iss

#define TCP_PAWS_IDLE	(24 * 24 * 60 * 60 * PR_SLOWHZ)
					/* timestamp wrap-around time */
#endif /* __APPLE_API_PRIVATE */

#ifdef KERNEL
#ifdef __APPLE_API_PRIVATE
extern tcp_cc	tcp_ccgen;		/* global connection count */
#endif /* __APPLE_API_PRIVATE */
#endif /* KERNEL */
#endif /* _NETINET_TCP_SEQ_H_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
d7e50217	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
d7e50217 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
d7e50217 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* Copyright (c) 1982, 1986, 1993, 1995
	27	* The Regents of the University of California. All rights reserved.
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions
	31	* are met:
	32	* 1. Redistributions of source code must retain the above copyright
	33	* notice, this list of conditions and the following disclaimer.
	34	* 2. Redistributions in binary form must reproduce the above copyright
	35	* notice, this list of conditions and the following disclaimer in the
	36	* documentation and/or other materials provided with the distribution.
	37	* 3. All advertising materials mentioning features or use of this software
	38	* must display the following acknowledgement:
	39	* This product includes software developed by the University of
	40	* California, Berkeley and its contributors.
	41	* 4. Neither the name of the University nor the names of its contributors
	42	* may be used to endorse or promote products derived from this software
	43	* without specific prior written permission.
	44	*
	45	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	46	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	47	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	48	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	49	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	50	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	51	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	52	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	53	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	54	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	55	* SUCH DAMAGE.
	56	*
	57	* @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
9bccf70c	58	* $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.5 2001/08/22 00:59:12 silby Exp $
1c79356b A	59	*/
	60
	61	#ifndef _NETINET_TCP_SEQ_H_
	62	#define _NETINET_TCP_SEQ_H_
9bccf70c	63	#include <sys/appleapiopts.h>
1c79356b A	64	/*
	65	* TCP sequence numbers are 32 bit integers operated
	66	* on with modular arithmetic. These macros can be
	67	* used to compare such integers.
	68	*/
	69	#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
	70	#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
	71	#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
	72	#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
	73
	74	/* for modulo comparisons of timestamps */
	75	#define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
	76	#define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
	77
	78	/*
	79	* TCP connection counts are 32 bit integers operated
	80	* on with modular arithmetic. These macros can be
	81	* used to compare such integers.
	82	*/
	83	#define CC_LT(a,b) ((int)((a)-(b)) < 0)
	84	#define CC_LEQ(a,b) ((int)((a)-(b)) <= 0)
	85	#define CC_GT(a,b) ((int)((a)-(b)) > 0)
	86	#define CC_GEQ(a,b) ((int)((a)-(b)) >= 0)
	87
	88	/* Macro to increment a CC: skip 0 which has a special meaning */
	89	#define CC_INC(c) (++(c) == 0 ? ++(c) : (c))
	90
9bccf70c	91	#ifdef __APPLE_API_PRIVATE
1c79356b A	92	/*
	93	* Macros to initialize tcp sequence numbers for
	94	* send and receive from initial send and receive
	95	* sequence numbers.
	96	*/
	97	#define tcp_rcvseqinit(tp) \
	98	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
	99
	100	#define tcp_sendseqinit(tp) \
	101	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
	102	(tp)->iss
	103
	104	#define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * PR_SLOWHZ)
	105	/* timestamp wrap-around time */
9bccf70c	106	#endif /* __APPLE_API_PRIVATE */
1c79356b A	107
1c79356b A	108	#ifdef KERNEL
9bccf70c	109	#ifdef __APPLE_API_PRIVATE
1c79356b	110	extern tcp_cc tcp_ccgen; /* global connection count */
9bccf70c	111	#endif /* __APPLE_API_PRIVATE */
1c79356b A	112	#endif /* KERNEL */
1c79356b A	113	#endif /* _NETINET_TCP_SEQ_H_ */